Strongly Correlated Quantum Walks in Optical Lattices

TL;DR

This paper demonstrates control over strongly interacting quantum walks with bosonic atoms in optical lattices, revealing correlation effects and Bloch oscillations, paving the way for studying complex quantum systems.

Contribution

It presents the first experimental realization of strongly correlated quantum walks with interacting bosons in optical lattices, enabling exploration of complex quantum phenomena.

Findings

Observation of correlations in two-particle quantum walks

Detection of strongly correlated Bloch oscillations

Scalability of the approach to larger systems

Abstract

Full control over the dynamics of interacting, indistinguishable quantum particles is an important prerequisite for the experimental study of strongly correlated quantum matter and the implementation of high-fidelity quantum information processing. Here we demonstrate such control over the quantum walk - the quantum mechanical analogue of the classical random walk - in the strong interaction regime. Using interacting bosonic atoms in an optical lattice, we directly observe fundamental effects such as the emergence of correlations in two-particle quantum walks, as well as strongly correlated Bloch oscillations in tilted optical lattices. Our approach can be scaled to larger systems, greatly extending the class of problems accessible via quantum walks